We challenged four blow-dryers—all promising a faster blowout—to a race. One tester with a medium-thick lob followed the same styling routine for five days. The products (shampoo and conditioner) and the brush stayed the same, but she swapped in a new blow-dryer each day. The models went up against the current speed demon, the T3 Featherweight Luxe 2i, which holds the title for the quickest blow-dry session: five minutes and 20 seconds. Here are the results.